Transitional image for a portion of a display screen



FIG. 1 is a front view of the first image state of a transitional image for a portion of a display screen showing our new design; and,

FIG. 2 is a front view of the second image state.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-2. The process or period in which one image transitions to another forms no part of the claimed design. The broken line showings of the circular region, the elongated bar region, and the display screen are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a transitional image for a portion of a display screen, as shown and described. 